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Through hole resistors are one of the specific types of electronic components used in circuits. These resistors are designed to resist, or decrease, the flow of electric current through a circuit, while also maintaining a certain degree of voltage and current flow in a controlled fashion. The specific purpose of using through hole resistors in a circuit can vary, but they are often found in applications that require precision or longevity in their electrical performance. One such example is the SQP300JB-16K, a surface-mount, thick-film resistors, which has various applications in various fields. This article will discuss the application field and working principle of the SQP300JB-16K.

Application Field

The SQP300JB-16K is a relatively large through hole resistor, measuring at 120 ohms at 25C and 40 ohms at 85C. It is particularly suited for applications that require precision, longevity and power consumption control, such as electronic circuit designs, motor controllers, power supplies, motor drivers, audio systems, and medical equipment. It is especially well-suited for motor control applications due to its ability to handle high currents and reduce resistance at high temperatures.

The SQP300JB-16K also features an improved temperature coefficient of less than 10ppm, meaning it is highly accurate in different temperatures. This also means that it is an ideal choice for applications that require more precise temperature measurements or control. The resistor also has a low internal resistance compared to other resistors, and its wide operating temperature range from -55C to +135C makes it suitable for a wide range of operating temperatures. Additionally, the terminal pins are almost invisible, making them ideal for small board and panel space applications.

Working Principle

Through hole resistors such as the SQP300JB-16K get their electrical resistance by using an insulating material between two conductors. When voltage is applied to the resistors, the insulating material placed between the two conductors resist the flow of electrons, creating a drop in voltage, and a rise in current, as electric current is forced to “work” against the resistance. The total resistance of the through hole resistor can be changed by adjusting the length, size, number, or type of the insulating material. The amount of resistance of the resistor determines how much current is allowed to pass through, and how the voltage is affected.

The SQP300JB-16K uses a thick-film process to create its resistance. In this process, a thick-film conductor, such as indium tin oxide (ITO), is applied onto a glass substrate or sheet, with the substrate being made from a ceramic material. The ITO is then fired at high temperatures in a vacuum, where the electrons become embedded into the ceramic substrate, creating a thick film in the desired pattern. This results in a resistor with an improved resistance coefficient.

The SQP300JB-16K is an ideal through hole resistor for applications that require high resistance and low temperature coefficient. Its high resistance allows it to be used on motor control applications, circuit designs, and audio equipment, while its wide temperature range and low coefficient of resistance makes it highly accurate in different temperatures. This makes it a valuable component in designing precision electronics.

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